Remove last vestigial uses of "update needed" png assets.
They were out of date, and in some cases redundant. Remove
the redundant uses completely and replace the others with
references to the vector versions.
BUG=
673995
Committed:
https://crrev.com/c821f28d145007603d0c1881075dd6ddbc97cf86
Cr-Commit-Position: refs/heads/master@{#438728}